Please read if you use FGL:
As you may now, for the past few months I've been (finally!) cleaning up FGL, adding tests, etc.
One of the issues that has arisen with this is that the behaviour of the delLEdge function is not well specified when dealing with multiple edges.
Specifically, the documentation states that the purpose is to "Remove an LEdge from the Graph." (emphasis added)... but the behaviour when dealing with multiple edges is to remove all such edges from the graph.
The current version on GitHub is to instead just delete a single such labelled edge, with a new function "delAllLEdge" that replicates the current behaviour.
Before releasing this change, however, I wanted to make sure that I wouldn't break people's code if they rely upon this functionality; I did try and search through GitHub to see who - if anyone - is using this function, but primarily found various copies of fgl embedded into other people's repositories.
As such, please check your code and let me know if this change in behaviour might affect you (if this is the case, I might let delLEdge keep the current behaviour and have a new function delete just one edge).